Optionaltext: string
optional. A text for the location
Optionaluri: string
a geo:// uri for the location
Optionaltimestamp: number
the timestamp when the location was correct (milliseconds since the UNIX epoch)
Optionaldescription: string | null
the (optional) label for this location on the map
OptionalassetType: LocationAssetType
the (optional) asset type of this location e.g. "m.self"
Generates the content for a Location event